Number1 = 8 Seconds Less Than Number2?

I have a count up timer that is a custom input one i made using arrays and number vars and what i am wanting to do is make it detect if seconds is 8 less then the users custom inputted seconds at the moment I have seconds detection like this

TicSecs == Timer_Control[3]

But I am not sure what operator to use to make it do something 8 seconds before it reaches Timer_Control[3] s value.

Any help would be appreiciated thanks in advance